1 files changed, 59 insertions, 0 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
new file mode 100644
index 000000000000..36725e7c02c6
--- /dev/null
+++ b/include/linux/pipe_fs_i.h
@@ -0,0 +1,59 @@
+#ifndef _LINUX_PIPE_FS_I_H
+#define _LINUX_PIPE_FS_I_H
+
+#define PIPEFS_MAGIC 0x50495045
+
+#define PIPE_BUFFERS (16)
+
+struct pipe_buffer {
+	struct page *page;
+	unsigned int offset, len;
+	struct pipe_buf_operations *ops;
+};
+
+struct pipe_buf_operations {
+	int can_merge;
+	void * (*map)(struct file *, struct pipe_inode_info *, struct pipe_buffer *);
+	void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *);
+	void (*release)(struct pipe_inode_info *, struct pipe_buffer *);
+};
+
+struct pipe_inode_info {
+	wait_queue_head_t wait;
+	unsigned int nrbufs, curbuf;
+	struct pipe_buffer bufs[PIPE_BUFFERS];
+	struct page *tmp_page;
+	unsigned int start;
+	unsigned int readers;
+	unsigned int writers;
+	unsigned int waiting_writers;
+	unsigned int r_counter;
+	unsigned int w_counter;
+	struct fasync_struct *fasync_readers;
+	struct fasync_struct *fasync_writers;
+};
+
+/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
+   memory allocation, whereas PIPE_BUF makes atomicity guarantees.  */
+#define PIPE_SIZE		PAGE_SIZE
+
+#define PIPE_SEM(inode)		(&(inode).i_sem)
+#define PIPE_WAIT(inode)	(&(inode).i_pipe->wait)
+#define PIPE_BASE(inode)	((inode).i_pipe->base)
+#define PIPE_START(inode)	((inode).i_pipe->start)
+#define PIPE_LEN(inode)		((inode).i_pipe->len)
+#define PIPE_READERS(inode)	((inode).i_pipe->readers)
+#define PIPE_WRITERS(inode)	((inode).i_pipe->writers)
+#define PIPE_WAITING_WRITERS(inode)	((inode).i_pipe->waiting_writers)
+#define PIPE_RCOUNTER(inode)	((inode).i_pipe->r_counter)
+#define PIPE_WCOUNTER(inode)	((inode).i_pipe->w_counter)
+#define PIPE_FASYNC_READERS(inode)     (&((inode).i_pipe->fasync_readers))
+#define PIPE_FASYNC_WRITERS(inode)     (&((inode).i_pipe->fasync_writers))
+
+/* Drop the inode semaphore and wait for a pipe event, atomically */
+void pipe_wait(struct inode * inode);
+
+struct inode* pipe_new(struct inode* inode);
+void free_pipe_info(struct inode* inode);
+
+#endif